<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>flex弹性布局</title>
  <style>
    /* body {
      margin: 0;
    } */
    #container {
      background-color: #f1eeee;
      width: 500px;
      height: 300px;

      display: flex; /* flex弹性布局 */
      flex-direction: row; /* 默认为row水平布局, 设置主轴 */
      /* flex-start: 从头开始排列 */
      /* flex-end: 从尾部开始排列 */
      /* center: 在主轴上居中对齐 */
      /* space-around: 平分剩余空间 */
      /* space-between: 先两边贴边, 再平分剩余空间 */
      justify-content: space-between; 
    }
    .item {
      background-color: rgb(184, 246, 184);
      border: 1px solid rgb(141, 138, 138);
      width: 100px;
      height: 50px;
    }
  </style>
</head>
<body>
  <div id="container">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
  </div>
</body>
</html>